Comparison with apple's xzone malloc

I'm starting this discussion here mostly as a conversation starter. Apple open sourced xzone malloc their https://github.com/apple-oss-distributions/libmalloc/tree/libmalloc-792.41.1/src/xzone_malloc which is apparently based on mimalloc itself, I wonder if there are any features that could be brought to mimalloc proper and how they stack up against each other.

Start by comparing Apple's xzone_malloc implementation at src/xzone_malloc with mimalloc's current behavior. The issue does not identify mimalloc files or tests, and completion would require defining which features are applicable and how they compare; this remains a discussion rather than a bounded change.

Written by the indexing model from the issue text.